Core - Added better way to flush LEDs

UI - Fixed a freeze when opening the device properties window of a device
Core - Updated RGB.NET sampler call for API changes

src/Artemis.Core/Services/Interfaces/IRgbService.cs

@@ -41,6 +41,11 @@ namespace Artemis.Core.Services
         /// </summary>
         bool RenderOpen { get; }
 
+        /// <summary>
+        ///     Gets or sets a boolean indicating whether to flush the RGB.NET LEDs during next update
+        /// </summary>
+        bool FlushLeds { get; set; }
+
         /// <summary>
         ///     Opens the render pipeline
         /// </summary>